[Tigers] Aluminum Heads--a downside?

[Steve Laifman]

Al,

Talked to Dr. Moonstone yesterday.  His contention is that the rate of 
heat radiated from a hot aluminum source bears a strong relationship to 
the thermal emissivity and a rough surface has more surface area than a 
polished one. In addition, paint provides a barrier to radiated thermal 
emission rates.

He is, of course, in the coating industry, and bears some attention to 
what he says.

I, also, agree with him.  If one does not have a temperature issue, then 
it doesn't matter.  But Tigers need attention to this area, especially 
when modified.  More H.P., more heat to be rejected.

Steve

___
Steve Laifman
Editor - TigersUnited.com



Alvin Johnson wrote:
> Hi Doc,
> Even given "paint-negation," it's a safe bet that painted heads will yield
> more HP than any Ford small block iron stocker ever will, no matter how
> ported, relieved or polished..
> First I've heard of it---how can external paint affect internal operation?
> Would the same hold true for an aluminum block?    Painted aluminum heads have
> been a favorite street racer trick for many years.
> Al J